Voltaic cell.



No. 672,!91. Patented Apr. l6, I901.

' W. H. LAWRENCE.

VULTAIC DELL.

(Application filed Oct. 9, 1897.) (No Model.)

ZZL/L THE Nonms PUERS 00., Puma-111110.: WASHINGTON n c.

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UNITED STATES PATENT OFFICE.

WASHINGTON H. LAWRENCE, OF CLEVELAND, OHIO, ASSIGNOR TO THE NATIONAL CARBON COMPANY, OF SAME PLACE.

VOLTAIC CELL.

SPECIFICATION forming part of. Letters Patent No. 672,191, dated April 16, 1901.

I Application filed October 9, 1897. Serial No. 654,716. (No model.)

To all whom it may concern:

Be it known that I, WASHINGTON H. LAw-' RENCE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented'certain new and useful Improvements in Voltaic Cells; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. Y

My invention relates to the class of voltaic cells which employ as one element a porous carbon cup adapted to contain a depolarizing lution.

agent, such as manganese dioxid and powdered charcoal.

One object of the invention is to provide a cheap form of carbon porous cup which will permit the cell to be easily and quickly charged, cleaned out, and recharged without injury to any of the parts of the cell, which will prevent the corrosive action of the solution orsalts upon the metal-bindingv-post, and with which the cell maybe effectually sealed.

Another object is to provide a porous carbon cup of such-construction that the'cell will become active immediately this cup is immersed in the solution. 1

The invention consists in the peculiar construction of the porous cup, ashereinafter described, and definitely pointed out in the claim.

In the drawings, Figure l is an elevation of myimproved cell, the porous cup being shown partly in section by full lines and the other parts of the cell-namely, the zinc element and the containing-jar by dotted lines. Fig. 2 is a bottomplan view.

Referring to the parts by letters, A represents the porous cup, the outer surface of which is longitudinally fluted orcorrugated for the purposeof increasingthe surface capable of being acted upon by the exciting so- This'cu p hasfan integral bottom a, and it has also at itsupper end an integral external horizontal fla ngea. When the cup is in the jar, this flange, resting upon the top of the jar, supports the cup, and it serves likewise as a cover for' the jar. The contacting surface may be sealed together with paraffin or like material to prevent the evaporation through this sleeve.

of the exciting liquid and the exudation of the so-called creeping-salts. A hole a is formed through the flange a, and an insulating sleeve or thimble B is inserted in this hole. The stem of the zinc element passes The binding-post of the carbon element is connected with the flange on its top and may consist of a threaded rod E, embedded in the material of which the flange is formed, and a thumb-nut e, which screws upon this rod. The upper end of the cup is closed by an easily-removable cover G,

which may rest upon an internal shoulder a When the cup is first immersed in the exciting liquid, these slits permit the liquid to pass to the interior of the cup much more quickly than they could through the porous walls thereof, and thus the cell comes more quickly into operation.

From the foregoing description it will be understood that the described cup may be made very cheaply. The depolarizing agent (indicated by D in the drawings) may be placed in the cup or emptied therefrom for the purpos'eof introducing 'a fresh charge by merely removing the cover.

Having described my invention, I claim In a voltaic cell, a porous carbon cup having at its upper end an integral annular flange and an externally-fluted cylindrical body extending therefrom, said body having an integral bottom and having a plurality of longitudinal slits extending fromnear the bottom'to the extreme lower edge, through the, cylinder, between the flutings and parallel'therewith, substantially as described.

WASHINGTON H. LAWRENCE. Witnesses:

FRANK D. LAWRENCE,

H. E. HAOKENBEY. 

